It's become abundantly clear in the last year that the world of comic book movies has changed in the wake of The Avengers. While Warner Bros. and DC look to jumpstart their shared movie universe with next month's Man of Steel, Fox and Sony are taking matters into their own hands with the X-Men and Spider-Man franchises, respectively.

Casting announcements for both Marvel properties have run rampant for months now, but while Sony has been revealing which iconic characters the Amazing Spider-man 2 actors will be portraying, Fox has taken quite the opposite approach with regard to its new cast additions for next year's time-bending mutant adventure X-Men: Days of Future Past.

We've known for a while that Hugh Jackman and virtually the entire cast of the X-Men film trilogy are set to join the principal characters of First Class. Neither Fox nor director Bryan Singer have announced who any of the new cast members are playing, leading to no small amount of guesswork on the part of sites like ours.

However, Singer himself recently took to Twitter to reveal what may be the latest clue about who Game of Thrones actor Peter Dinklage will play. Here's Singer's tweet followed by the accompanying image:

The above photo may not seem immediately forthcoming as far as the identity of Dinklage's character. Yet, it's worth mentioning that Dinklage himself seems to be sporting a thick mustache that just so happens to reflect the comic book depiction of Bolivar Trask. In the comics, Trask was the man responsible for the creation of the mutant-hunting robots known as Sentinels, and it's been heavily speculated that Dinklage will be playing the main villain of Days of Future Past, which is expected to prominently feature The Sentinels.

It's starting to look more and more likely that Dinklage – as has long been rumored – will be playing the X-Men movie universe version of Trask, but there's one problem with that. The character has already been included in a previous X-Men film. Bill Duke portrayed Trask in X-Men: The Last Stand as the Secretary for the Department of Homeland Security and, in that regard, has already gone up against Magneto and his Brotherhood of Mutants, at least to some extent.

The two actors clearly bear no resemblance, but Trask's role in Last Stand was minimal at best. Considering that the film is widely regarded among the weakest entries in the X-Men franchise, it is possible that Singer has merely opted to ignore his appearance in that film as a canonical part of Days of Future Past. On the other hand, he could also embrace that the character was introduced and simply redefine him for this story. However, such an approach would seem contrary to Singer's intention of cleaning up a few of the continuity issues plaguing the existing films.

Do you think Singer's tweet implies that Dinklage is playing Trask, or do you need more evidence to convince you? Let us know in the comments what you hope to see in X-Men: Days of Future Past.